Influence of particle size on physicochemical properties of pharmaceutical powders.-2-On packing of sodium borate and boric acid powders

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  • Influence of Particle Size on Physicochemical Properties of Pharmaceutical Powders. II. On Packing of Sodium Borate and Boric Acid Powders.

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Packing problems of sodium borate and boric acid powders are investigated. The apparent volume per gram of the samples in loosest packing is nearly constant in the region larger than the critical size, but in the region smaller than that, it increases gradually with decrease of particle diameters. The critical diameters obtained at the loosest packing in air are equal to that obtained by measurement of angles of repose and sliding angles. The relations between porosity (εo, εc) or the apparent density (ρc, ρo) and particle diameter (D) are represented by εo-εc=A exp (-BD) ρc-ρo=ρA exp (-BD) and the following relations have also been obtained between porosity or apparent density and C/Mg for sodium borate powders. εo-εc=0.43 C/Mg ρc-ρo=0.72 C/Mg (εo-εc) or (ρc-ρo) might be adopted as the degree of cohesion.

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